| FCSN | Fargo Catholic Schools Network 
| Others |
| FCSN | Federation for Children with Special Needs
| Others |
| FCSN | Fire Control Technician Seaman
| Others |
| FCSN | Fire Controlman Seaman
| Others |
| FCSN | Firefighter Cancer Support Network
| Others |
| FCSN | Football Club Saint-Nazairois (French football club)
| Others |
| FCSN | Football Club Serquigny Nassandres (French football club)
| Others |
| FCSN | Freiburger Cardiac Survival Network
| Others |
| FCSN | Friends of Children with Special Needs
| Others |
| FCSN | Seaman, Fire Controlman Striker (Naval Rating)
| Others |